An unnamed source in the Russian military command told the news service Russia's military leadership has received dates and scenarios of the invasion from their counterparts in the U.S.

The Interfax source, described as a high-ranking official at military headquarters in Moscow, said the invasion will begin once 150,000 U.S. troops are in place in bases around Iraq.

He said it will be a combined land, air and sea operation and American military planners expect the war to last less than a month.